Diagnostics A

DIAGNOSTICS "A" - CLIMATE CONTROLLED SEAT SHUTS OFF AFTER LESS THAN 10 SECONDS

Turn the engine off and the ignition key to the "ON" position.

If the climate controlled seat shuts down prematurely, there must be a DTC(s) stored in the CCSM. Check the appropriate (driver or passenger side) CCSM for DTC(s):

If a B1342 (ECU is Defective) is set, verify power and grounds and replace the CCSM, perform PMI and re-test the system for proper operation. If B1342 and B2486 (Climate Controlled Seat Voltage Out of Range) are present in the CCSM. In this case, perform PMI, then attempt to clear the B1342 from the module.

If the B1342 will clear, follow diagnostics below for correcting the B2486.

^ If the B1342 will clear, follow diagnostics below for correcting the B2486.

^ If the B1342 will NOT clear, verify power and grounds replace the CCSM, perform PMI and re-test the system for proper operation.

If a B1358 (Ignition Switch or Blower Electronics Circuit Short to Ground) is set, refer to online Workshop Manual Section 501-10 Pinpoint Test Q for electrical checks.

If a B2486 (Climate Controlled Seat Voltage Out of Range) is set, check Circuit 294, the start/run power input to the climate controlled seat module. Input voltage at the module must be between 8.5 and 16.5 Volts with the ignition key in "START' or "RUN", or the module will set this code. If no trouble found with circuit 294, refer to Workshop Manual Section 414-00 for charging system checks.

If a B2488 (Thumb-Wheel Switch Voltage Out of Range High) is set, refer to online Workshop Manual Section 501-10 Pinpoint Test R for electrical checks.

If a B2521 (Tach Circuit Failure) is set, refer to online Workshop Manual Section 501-10 Pinpoint Test Q for electrical checks.

If a B2792 (Heat Switch Short to Ground) or B2793 (Cool Switch Short to Ground) is set, refer to online Workshop Manual Section 501-10 DTC Index for direction.